CODEWITHSUNDEEP
ccryptographytpm
shyam
shyam

Reputation: 43

Trusted Platform Module (TPM) TSS program compilation error

I am new to TPM. I want to generate random bytes using TPM via Esapi(esys) interface. I am trying to initialise Esys_Initialize(). Below is my code:

#include "/usr/include/tss2/tss2_esys.h"

int main(){
    
    TSS2_RC rc;
    size_t tcti_size;
    TSS2_TCTI_CONTEXT *tcti_context = NULL;
    TSS2_TCTI_CONTEXT *tcti_inner = NULL;
    ESYS_CONTEXT *esys_context;
    
    TSS2_ABI_VERSION abiVersion;
    abiVersion.tssCreator=0x1;
    rc=Esys_Initialize(&esys_context, tcti_context,&abiVersion);
    
    return 0;
}

The error message is:

[root@Centos8_machine tpm]# gcc test.c
/tmp/ccUvOoY1.o: In function
`main': test.c:(.text+0x32): undefined reference to `Esys_Initialize'
collect2: error: ld returned 1 exit status

Can someone please tell where I am missing? Thanks in advance.

Upvotes: 1

Views: 806

Answers (1)

f9c69e9781fa194211448473495534
f9c69e9781fa194211448473495534

Reputation: 4620

An "undefined reference" error means you are not linking against the library providing the missing symbol. In this case, you need to link against the library that provides the Esys_Initialize function.

If you are compiling manually, you could use:

$ gcc $(pkg-config --cflags --libs tss2-esys) test.c

In this case I used pkg-config --list-all | grep tss to find the name of this package. You could also inspect the needed compiler and linker flags manually:

$ pkg-config --cflags --libs tss2-esys
-I/usr/include/tss -ltss2-esys

If you are not building manually but need to use a build system (such as make, cmake, ...) or an IDE, then you would have to add those compiler flags (-I/usr/include/tss) and linker flags (-ltss2-esys) to your build systems. The specific steps would depend on what build system you are using.

Upvotes: 2

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